Cheeseburger Soup

Ingredients (16)

• 1/2 pound ground beef
• 4 tablespoons butter, divided
• 3/4 cup chopped onion
• 3/4 cup shredded carrots
• 3/4 cup diced celery
• 1 teaspoon dried basil
• 1 teaspoon dried parsley flakes
• 1-3/4 pounds (about 4 cups) cubed peeled potatoes
• 3 cups chicken broth
• 1/4 cup all-purpose flour
• 8 to 16 ounces Velveeta, cubed
• 1-1/2 cups whole milk
• 3/4 teaspoon salt
• 1/4 to 1/2 teaspoon pepper
• 1/4 cup sour cream
• Optional: Onion rings and thinly sliced green onions